Abstract: In order to investigate the influences of the organic materials on Leymus chinensis growth and the available nitrogen content of coastal saline soil, by the pot experiment method, the organic matters were added to the coastal saline soil for Leymus chinensis growth. The pot tests were designed with three factors and two levels, different organic materials（stalk powder, microbial bacterial manure and chicken manure）were added to the soil, and the seed germination, fresh weight and available nitrogen content were analyzed. The results indicate that compared with the control, organic matters can increase the germination rate and fresh weight of Leymus chinensis. Single organic matter showed positive effect on the fresh weight and germination rate of Leymus chinensis, and the effects of treatments were straw powder>chicken manure>microbial bacterial manure. There were significant differences among different improving materials or different combinations, and it is showed the influences of different types of organic nitrogen fertilizer on the growth of Leymus chinensis were also different. There was no significant difference among the available nitrogen contents when adding a single organic material to soil, but there were significant differences among the available nitrogen contents when adding to the combinations.

Key words: coastal saline soil, available nitrogen, Leymus chinensis, germination rate, fresh weight, relevance